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首页> 外文期刊>Russian Journal of Nondestructive Testing >Ultrasonic Nondestructive Testing Accurate Sizing and Locating Technique Based on Time-of-Flight-Diffraction Method
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Ultrasonic Nondestructive Testing Accurate Sizing and Locating Technique Based on Time-of-Flight-Diffraction Method

机译：基于飞行时间衍射法的超声无损检测准确定径与定位技术

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摘要

The ultrasonic time-of-flight-diffraction (TOFD) method is a widely used flaw sizing and locating method. A signal identification technique is used to improve the arrival time resolution of a TOFD signal and to size and locate flaws more accurately. The ultrasonic signal is decomposed into several intrinsic mode functions by empirical mode decomposition. Some modes are selected to reconstruct a new signal considering their frequencies and energy. The reconstructed signal has a better signal-to-noise ratio and enhanced flaw information. A Hilbert transform is conducted to get the envelope and exact arrival time of the signal. All vertical flaws can be detected correctly with average sizing and locating accuracy of 0.08 mm in the laboratory. The deeper the flaw is located, the higher the accuracy. The blind area of TOFD is reduced to 2.5 mm under the surface.
机译：超声飞行时间衍射（TOFD）方法是一种广泛使用的缺陷尺寸确定和定位方法。信号识别技术用于提高TOFD信号的到达时间分辨率，并更精确地确定和定位缺陷。通过经验模态分解将超声信号分解为几个固有模态函数。考虑到它们的频率和能量，选择一些模式来重建新信号。重建的信号具有更好的信噪比和增强的缺陷信息。进行希尔伯特变换以获得信号的包络和精确到达时间。在实验室中，所有垂直缺陷均可以正确检测，平均大小和定位精度为0.08 mm。缺陷位于的位置越深，精度越高。 TOFD的盲区减少到表面以下2.5毫米。

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